Chamberlain 7200 - Adjustment Section; Adjust UP and DOWN Limits

Adjustment
Step
1
Adjust
the UP and
DOWN
Limits
Do not make
any
limit adjustments
untilthe
Safety
Reversing
Sensors
are completely
installed.
Adjustment
Section:
Pages
28
-
30
Limit adjustment
settings
regulate
the
points
at
which the
door
will sfop
when moving
up
or down.
The door
will sfop
in the
up direction
if anything
intederes
with door
travel.
The
door
will reverse
in
the
down
direction
if anything
interferes
with the
door
travel
(including binding
or unbalanced
doors).
To operate
the
opener,
press
the
Door Control
push
bar
or button.
Run the
opener
through
a
complete
travel
cycle.
.
Does
the door
open
and close
completely?
.
Does the
door
stay closed
and
not
reverse
unintentionally
when
fully closed?
lf
your
door
passes
both of
these
tests,
no limit
adjustments
are
necessary
unless
the
reversing
test
fails
(see
page
30).
Adjustment
procedures
are
outlined
below.
Run
the
openêr
through
a complete
travel
cycle
after
each adjustment.
Repeateci
operation'of
the
opener
during
adiustment
procedures may cause
the
motor
to overheat
and
shut off.
Simply
wait
15 minutes
and
try again.
Read
the
procedures
carefully
before
proceeding
to
Adjustment
Step
2. Use
a screwdriver
to
make
limit
adjustments.
Cover
Protection
Bolt
Left
Side
Panel
Limit
Adjustment
Screws
Adjustment
Label
.
lf the door
does
not
open completely,
but
opens
af leasf
five
feet:
lncrease
uplravel.
Turn
the UP
limit
adjustment
screw
clockwise.
One
turn
equals
2" of
travel.
NOTE:
To
prevent
the
trolley
from
hitting
the
cover
protection
bolt,
keep a
minimum
distance
of
2-4" between
the
trolley
and the
bolt.
.
lf door does
not
open
at least
5 feet:
Adjust
the UP
(open) force
as explained
in
Adjustment
Step
2.
.
lf the door
does
not
close
completely:
lncrease
dcwntravel.
Turn
the
DOWN
limit
adjustment
screw
counterclockwise.
One turn
equals
2"
of travel.
lf the door
still
won't
close
completely
and
the trolley
bumps
into
the
pulley
bracket
(see
page
4
or
5), try
lengthening
the door
arm
(see
page
26).
How
and
When
to
Adjust
the
Limits
lf
you
have adjusted
the door
arm to
the maximum
length
and the
door
still
will not close
completely,
Iower
the header
bracket.
See
lnstallation
Step
1,
pages
12and
13.
.
lf the opener
reverses
in
fully closed
position:
Decrease
downtravel.
Turn the
DOWN
limit
adjustment
screw
clockwise.
One turn
equals
2" of
travel.
.
lf the
door
reverses
when closing
and
there
is
no
visible
interference
to travel
cycle:
lf the
opener
lights
are flashing,
the
Safety
Reversing
Sensors
are either
not
installed,
misaligned,
or
obstructed.
See
Troubleshooting,
page
23.
Test the door
for
binding:
Pull the
manual
release
handle.
Manually
open
and
close the
door.
lf the door
is
binding,
call
for
garage
door
service.
lf the door
is
not
binding
or unbalanced,
adjust
the
DOWN
(close)
force.
See
Adjustment
SteP
2.
lmproper
adjustment
of the travel
limits
will
interfere
with the
proper
operation
of
the
safety
reverse
system.
The door
might
not
reverse
properly
when required
and
could
seriously
injure
or
kill someone
under
if.
Test
the
safety
reverse
system
following
all
adjustments
to the
travel
limits. See
page
30'
.9.-
q
INCREASÈ\RAVÊL\
oowN
\\
ó
o
9g
INCREASE
TRAVEL
DOWN UP
28
Nortek, Exhibit 1012